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/*
* Early initialization code for aarch64 (a.k.a. armv8)
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; version 2 of
* the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/asm.h>
#include <soc/addressmap.h>
// based on arm64_init_cpu
ENTRY(secondary_init)
/* Initialize PSTATE (unmask all exceptions, select SP_EL0). */
msr SPSel, #0
msr DAIFClr, #0xf
/* TODO: This is where we'd put non-boot CPUs into WFI if needed. */
/* x22: SCTLR, return address: x23 (callee-saved by subroutine) */
mov x23, x30
/* TODO: Assert that we always start running at EL3 */
mrs x22, sctlr_el3
/* Activate ICache (12) already for speed during cache flush below. */
orr x22, x22, #(1 << 12)
msr sctlr_el3, x22
isb
/* Invalidate dcache */
bl dcache_invalidate_all
/* Deactivate MMU (0), Alignment Check (1) and DCache (2) */
and x22, x22, # ~(1 << 0) & ~(1 << 1) & ~(1 << 2)
/* Activate Stack Alignment (3) because why not */
orr x22, x22, #(1 << 3)
/* Set to little-endian (25) */
and x22, x22, # ~(1 << 25)
/* Deactivate write-xor-execute enforcement (19) */
and x22, x22, # ~(1 << 19)
msr sctlr_el3, x22
/* Invalidate icache and TLB for good measure */
ic iallu
tlbi alle3
dsb sy
isb
/* Load core ID to x0 */
mrs x0, MPIDR_EL1
and x1, x0, # 0xf
lsr x0, x0, 4
and x0, x0, # 0xff0
orr x0, x0, x1
/* Each core gets CONFIG_STACK_SIZE bytes of stack */
mov x2, # CONFIG_STACK_SIZE
mul x1, x0, x2
/* Backup core id */
mov x22, x0
ldr x0, =_stack_sec
add x0, x1, x0 // x0 = CONFIG_STACK_SIZE * coreid + _stack_sec
add x1, x0, # CONFIG_STACK_SIZE // x1 = x0 + CONFIG_STACK_SIZE
/* Initialize stack with sentinel value to later check overflow. */
ldr x2, =0xdeadbeefdeadbeef
1:
stp x2, x2, [x0], #16
cmp x0, x1
bne 1b
/* Leave a line of beef dead for easier visibility in stack dumps. */
sub sp, x0, #16
/* Set arg0 to core id */
mov x0, x22
/* Call C entry */
bl secondary_cpu_init
ENDPROC(secondary_init)
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